1. Proximity Cryogenics P&IDs Meeting
Michel CHALIFOUR
(on behalf of the CERN Neutrino Cryogenic Group and David Montanari)
Neutrino Platform General Bi-weekly Meeting
March 3, 2016
Proto Dune-DP-NP02

2. Process and Instrument Diagram Operation modes
Outline
Project Requirements
Process and Instrument Diagram
Operation modes
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

3. Engineering parameters (from Detector Requirements)
Mode
Parameter
Value
Notes 1
GAr purge flow rate
88 m3/hr
From 1.2 m/hr 2
Maximum cool-down rate TPC
40 K/hr
10 K/m
Maximum Delta T between any two points in the detector
50 K 3
LAr filling flow rate (*)
18 l/min
Assuming 2 trucks/day (**) 4
Cryostat static heat leak
3.0 kW
GAr boil-off (18 g/s)
Other heat loads (estimate)
5.0 kW
Total estimate is ~ 8 kW
LAr circulation (5 days turnover)
72 l/min (19 gpm)
Nominal value (1 pump) 5
Emptying (w both LAr pumps)
144 l/min (38 gpm)
Limited by size of tank/truck
* Value might be limited by the pressure inside the LAr storage dewar.
** We need to contact the supplier to confirm availability of 2 trucks/day of LAr.
Note: Noise, micro phonics and vibrations inside the LAr volume will be studied with an external pump configuration.
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

4. Cryogenic systems
Internal Cryogenics (not part of Neutrino Cryogenic group scope):
Inside the cryostat.
GAr/LAr distribution for cryostat purge, cool down, fill.
Interface control document needs to be created in-between proximity and internal cryogenics for physical and functional parameters (eg: temperature sensors/quantity and location for operation, Larg and Garg mass flow rate to cool down, interlock on Temperature, etc...)
Proximity Cryogenics:
Circulate and purify LAr.
Achieve and maintain LAr purity.
Recondense and purify boil off GAr.
Infrastructure/External Cryogenics:
Receive Ar/N2.
Transport GAr/LAr, GN2/LN2 to Proximity.
Vents.
Technical Specification/Tender will cover these 2 parts only
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

5. Modes of operation Piston Purge Cool down Filling Normal operations
Before starting piston purge, a purging and flushing of all argon circuits is mandatory
GAr is slowly flown from the bottom of the tank to push the impurities out from the top.
Cool down
A mix of GAr and LAr is flown into sprayers to generate a mist of small liquid droplets that are moved around by another set of sprayers flowing GAr only.
Filling
Once the cryostat and TPC are cold, LAr is introduced in the cryostat.
Normal operations
LAr is continuously purified by means of an external LAr pump (2 are installed for redundancy, but only one is in use).
Boil-off GAr is recondensed outside of the cryostat and purified before being reintroduced as LAr.
Emptying
At the end of the operations (or if/when maintenance on the tank is needed), the tank is emptied and the LAr removed.
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

6. Storages tanks & Regeneration system / External Cryogenics
LArg storage tank
LN2 storage tank
Regeneration system
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

7. Filtering system / Proximity Cryogenics
Purity monitor
LArg filters
GArg filter
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

8. Cryostat / Distribution system / Proximity & Internal Cryogenics
LN2 Phases Separator
Condenser
LArg circulating
Pump-Optional?
LArg circulating
pumps
LArg Phases Separator
Needed?
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

9. Operation Modes
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

10. Operation Mode PURGE IN OPEN LOOP 03.3.16
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

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13. Operation Mode PURGE IN CLOSED LOOP 03.3.16
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

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16. Operation Mode COOL DOWN 03.3.16
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18. Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02
If needed
Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

19. Operation Mode FILLING 03.3.16
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22. Operation Mode NORMAL OPERATION 03.3.16
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24. Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02
If needed
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25. Operation Mode EMPTYING 03.3.16
Michel CHALIFOUR P&IDs Review Proto Dune-NP02

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28. Operation Mode FILTER REGENERATION 03.3.16
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